I got the idea from another story, but that is my version. In order to get to Fishman Island, Luffy and his crew stopped at Sabaody. But during a battle with a pacifista, Chopper was captured by the arrancars. This is the first of a three part series

Learning that in order to get to Fishman Island at the bottom of the ocean, the Straw Hat Pirates landed in Sabaody. While there, Camie, the mermaid and a friend of theirs and Hatchan, was captured and put on sale at the Human Auction. Nami tries to buy Camie's freedom but she was bought by one of the celestial dragons. Enraged, Luffy struck the man that bought Camie, knowing that the navy should send an admiral to hunt him and his crew down. With help from the other pirate captains, Trafalgar Law and Eustass Kid, and "Dark King" Rayleigh, first mate of Gold Roger, Luffy fought off the navy forces. On their way to their own ships, Kid and Law, with their crews, encountered Kuma and engaged in battle. When it seemed like Kuma was defeated, there was another one to take his place. Elsewhere, Luffy and his crew are to a place to hide when the admiral arrives, until…

"Who are you," Luffy asked the figure in front of him.

The other Straw Hats knew the man was. His name is Kuma.

"Watch out, Luffy," Usopp warned, "He's a warlord of the sea."

"How do you guys know that?"

"Be careful," Sanji said, "Don't get hit by his attacks, it's a shockwave."

Kuma removed his gloves and form a strange yellow ball with his palm. After the ball was completed, he fired it like a beam. The Straw Hats were shocked at what they saw.

"What is this," Franky asked.

"He could do that, too," Usopp said surprised.

"Hey, you guys said that it was a shockwave," Luffy stated.

"That was…" Chopper started.

"…A beam," Luffy and Chopper said with stars in their eyes.

"This isn't the time to be excited, idiots," Usopp shouted, "So calm down."

"Bartholomew Kuma," Robin said, "Why is he back?"

"Bastard," Zoro said under his breath.

"Hold on a second," said Luffy, "This is the guy that showed up in Thriller Bark?"

"Yeah," Usopp replied, "He uses the paws on his palms and he almost killed us with that explosion he caused."

"He thought he got rid of us back then," Chopper said, "He's back after finding out we survived."

"So this is payback for last time," said Franky, "Coup de Vent"

Franky fired an air blast to push Kuma back to the mangrove behind him. Luffy squatted down with one of his fist on the ground and said, "Gear Second."